TRUCK SERVICE MANUALTM 5-4210-230-14&P-1on floor jacks. Brake drag is checked by "feel", rotating thedrum in the direction of forward rotation as adjustment ismade.Be sure the wheel bearings are properly adjusted (refer toWHEELS, RIMS, TIRES Section, CTS-2032) and with brakedrums cool.Adjust each shoe in turn by rotating adjuster cam studand drum in forward direction of drum rotation until a lightdrag is noticeable (Fig. 4). Do not apply excessive force onstud -13.6 N·m (120 in. lbs.) maximum. Back off adjusterstud slightly (approximately 6 to 12 degrees). Drum shouldturn freely.Repeat procedure on opposite cam stud.Perform same operation on brake group on opposite sideof vehicle.BRAKE SHOE REMOVALRefer to Fig. 1 for numbers in parenthesis.1.Position vehicle on floor stands so that the wheelsare free to turn.2.Remove wheel hub and drum assemblies.3.Secure pistons in wheel cylinders with cylinderclamps.4.Remove brake shoe retracting springs.5.Remove each shoe hold-down "C" washer (12) andwasher (11).6.Pull shoes free from adjuster cams and then rotateshoe from brake group freeing ends of wheelcylinders.If wheel cylinder connector tubes (21) are removed, markwheel cylinder ports to which tubes are attached to avoid errorin re-assembly. Difficulty will be encountered in bleedingoperation if tubes are assembled in wrong location.Fig. 4 Brake AdjustmentCLEANING AND INSPECTIONThoroughly clean all parts (except drums) free of dirt andgrease with cleaning solvent and wipe dry.Because studies have indicated that exposure , toexcessive amounts of asbestos dust may be a potential healthhazard, OSHA has set maximum limits of levels of airborneasbestos dust to which workers may be exposed. Since mostautomotive friction materials normally contain a sizableamount of asbestos, it is important that people who handlebrake linings be aware of the problem and know theprecautions to be taken.OSHA standards should be consulted with respect tomandatory requirements as well as for suggested proceduresto minimize exposure.DRUMS, BRAKE SHOES AND LININGFor complete details pertaining to reconditioning drumsand shoes, refer to CTS-2779.WHEEL CYLINDERSInspect wheel cylinders for signs of fluid leakage ordeteriorated rubber dust boots. If brake fluid is leaking out ofwheel cylinders, replace or recondition wheel cylinders.Some brake groups have wheel cylinder piston stops andthe wheel cylinder must be removed for reconditioning.The two wheel cylinders mounted on one brake areidentical; HOWEVER, CYLINDERS FOR LEFT OR RIGHTHAND BRAKES HAVE OPPOSITE CASTINGS.Clean mating surfaces of cylinders and backing platebefore assembly to insure proper alignment.RETRACTING SPRINGSInspect retracting spring for distortion such as nicks,twisted shanks or spread of coils. Damaged spring must bereplaced.ADJUSTING CAM AND SHOE GUIDE STUDSAdjustment cam and shoe guide studs are equipped withfriction springs. They should easily turn with a wrench, butshould not be loose. If frozen, lubricate with penetrating oiland work free.CTS-2078T - Page 4PRINTED IN UNITED STATES OF AMERICA